Here's a script to help to unmask those values.
col data_value for a50
accept SQLID prompt 'Enter SQL ID : '
select position
, case datatype
when 180 then to_char(anydata.accesstimestamp(value_anydata),'DD-MON-YYYY HH24:MI:SS')
when 12 then to_char(anydata.accessdate(value_anydata),'DD-MON-YYYY HH24:MI:SS')
else value_string
end data_value
from v$sql_bind_capture
where sql_id = '&SQLID';